C++ Solution Archives - TO THE INNOVATION

Min Stack LeetCode Solution

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Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.

Find First and Last Position of Element in Sorted Array LeetCode Solution

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Given an array of integers nums sorted in non-decreasing order, find the starting and ending position of a given target value. If target is not found in the array, return [-1, -1].

Pow(x n) LeetCode Solution

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Implement pow(x, n), which calculates x raised to the power n.

Group Anagrams LeetCode Solution

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Given an array of strings strs, group the anagrams together. You can return the answer in any order.

Rotate Image LeetCode Solution

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You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise).

Permutations II LeetCode Solution

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Given a collection of numbers, nums, that might contain duplicates, return all possible unique permutations in any order.

Jump Game II LeetCode Solution

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You are given a 0-indexed array of integers nums of length n. You are initially positioned at nums[0]. Each element nums[i] represents the maximum length of a forward jump from index i. In other words, if you are at nums[i], you can jump to any nums[i + j] where: 0 <= j <= nums[i] and i + j < n. Return the minimum number of jumps to reach nums[n - 1].

Wildcard Matching LeetCode Solution

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Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for ‘?’ and ‘*’ where: ‘?’ Matches any single character.’*’ Matches any sequence of characters (including the empty sequence).The matching should cover the entire input string.

Multiply Strings LeetCode Solution

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Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as a string.

Trapping Rain Water LeetCode Solution

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Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.

First Missing Positive LeetCode Solution

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Given an unsorted integer array nums, return the smallest missing positive integer.

Combination Sum II LeetCode Solution

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Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where the candidate numbers sum to target.

Combination Sum LeetCode Solution

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Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where the chosen numbers sum to target. You may return the combinations in any order.

Swap Nodes in Pairs LeetCode Solution

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Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the list’s nodes.

Longest Valid Parentheses LeetCode Solution

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Given a string containing just the characters ‘(‘ and ‘)’, return the length of the longest valid (well-formed) parentheses substring.